Make up the sentences using the correct grammar tense.
1) he/send/the invitation/two days ago.
2) she/ decorate/the roo/for two hours now.
3) they/just/build/a new shopping centre.
4) we/perform/the show/in a week.
5) this team/always/represent/our school/at the competitions.
6) they/demonstrate/the work/of a new gadget/at the moment.